JPH0642286A - Method and device for constructing underground structure - Google Patents

Abstract

PURPOSE:To make it possible to construct a wide underground structure without interrupting upper ground traffic and especially either eliminate an arrival shaft or accept even a very small-sized arrival shaft and jacking an underground structure from both sides of a planned tunnel and unit them in the center of the planned tunnel when jacking and constructing longitudinally a large-sized underground structure at a position at which the earth coverage of the underground structure is shallow. CONSTITUTION:A friction cutter plate 6 is installed to the top of loop pipes 5 whose cross section is box-shaped. To comply with a required position of the planned tunnel, the pipes 5 are laid out in parallel so as to match with the cross section and connected one by one from a launching pit 9 and press- fitted underground by a required length. The front end of the underground structure 9 is opposed to and brought near to the rear end of the loop steel pipe 5. The rear end of the loop steel pipe 5 is cut by a proper length while the friction cutter plate 6 is left over underground. Then, the friction cutter plate 6 is used to shield-propel the underground structure 9 by the length equivalent to the eliminated portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is particularly intended to obstruct upper traffic when excavating a large number of underground structures in the transverse direction at a shallow depth of soil such as railways and roads. The present invention relates to a method for constructing an underground structure that can be installed without any trouble and an apparatus used for the method.

[0002]

2. Description of the Related Art In order to dig a large number of reinforced concrete underground structures into the lower ground such as railways and roads in the transverse direction, a protective work for supporting upper traffic is required. Providing a pipe roof in which steel pipes and the like are arranged in parallel horizontally is mentioned.

This is to excavate both a starting pit and a reaching pit on both sides of a planned tunnel across a railroad or the like, and in the ground of an appropriate depth below the railroad or the like, a large number of them are provided in a direction substantially perpendicular to the railroad or the like. After constructing the pipe roof protection work by horizontally squeezing the steel pipes in parallel with each other and press-fitting them horizontally, the earth retaining pipe and the steel pipes on the side are connected from one vertical shaft of the starting shaft and the reaching shaft to the other vertical shaft. Excavate the tunnel while constructing supporting supports. Then, a concrete underground structure is built in the tunnel.

However, in such a conventional pipe roof protector, the work for constructing the pipe roof protector must be carried out prior to the tunnel excavation work and the underground structure construction work. Since the three types of construction are carried out separately, the construction period and construction cost are large, and the labor and economic loss are large.

Further, since the steel pipe is buried in the ground to thereby support the railway and the overburden portion and to construct a tunnel to be an underground passage thereunder, the diameter of the overburden portion and the steel pipe pipe is reduced. In addition, a work space is required to make the tunnel crown between the tunnel crown and the pipe roof, and the tunnel must be constructed deeper by these amounts.

On the other hand, the inventor does not have to separately construct a protective work for the underground structure to be dug into the ground as shown in FIGS. Because it is done, several types of construction can be done at once,
Moreover, we have invented and applied for a method of constructing an underground structure that can be constructed safely, reliably, and inexpensively, and that can be constructed with a shallow soil cover.

Referring first to FIG. 7, a retaining steel sheet pile 2 is driven beside the upper traffic 1 such as a railroad to construct a starting pit 3 and a reaching pit 4, and a press-fitting machine (Fig. (Not shown) is installed so that the box-shaped roof steel pipe 5 is press-fitted toward the reaching pit 4. The press-fitting machine has an extruding mechanism such as a jack for the roof steel pipe 5 and an internal excavating mechanism for the steel pipe 5 such as an auger.

The roof steel pipe 5 is a box-shaped tubular body having a substantially square cross section, and a friction cutter plate 6 made of a flat steel plate is provided on the upper surface thereof. The friction cutter plate 6 has its tip fixed to the tip of the roof steel pipe 5 by welding or the like, but except the tip, the friction cutter plate 6 is simply placed on the upper surface of the roof steel pipe 5 in an overlapping manner. When the friction cutter plates 6 are sequentially connected one by one, the friction cutter plate 6 is also connected by welding or the like for the length of the roof steel pipe 5 to make it longer.

The arrangement of the steel pipes 5 is made according to the required location of the cross section of the planned tunnel. As shown in FIGS. 4 to 6, one-letter type (FIG. 4), gate type (FIG. 5), box type (FIG. 6), etc. Is appropriately selected according to the underground structure 9 forming the tunnel. In the case of the one-letter type shown in FIG. 4, it is possible to combine an ordinary pipe roof 20 on the outside.

Next, a reaction wall 8 and an underground structure 9 made of a concrete box called a box culvert are set in the starting pit 3, and a thrust pushing jack is provided between the reaction wall 8 and the underground structure 9. 10 is provided, a hood-shaped blade 11 is provided at the tip of the underground structure 9, and a small jack 12 is interposed between the tip of the underground structure 9 and the rear end of the roof steel pipe 5. In the figure, 21 is a support member for supporting the lower surface of the rear end of the roof steel pipe 5, 14 is a strut interposed between the reaction wall 8 and the push-push jack 10, and 13 is a rear end of the friction cutter plate 6. The stop member of the
Is provided on the side of the start pit 3.

The adhesion between the tip of the friction cutter plate 6 and the front end of the roof steel pipe 5 is released, and the underground structure 9 is used as a reaction force member with a small jack 12 to form the roof steel pipe 5.
Push forward. The underground structure 9 is excavated by the original pushing propulsion jack 10 while applying a reaction force to the reaction force wall 8 under the friction cutter plate 6 by the amount pushed. At this time, the friction cutter plate 6 is left in the ground.

In this way, by advancing the underground structure 9 under the friction cutter plate 6 while leaving the friction cutter plate 6, the peripheral surface of the underground structure 9 advances with the edge cut off from the ground, It does not suffer from frictional resistance due to earth pressure. Further, in order to advance the underground structure 9, the front part of the cutting edge 11 is excavated, but this work is protected by the steel pipe 5 for the roof, and it can be safely performed without the risk of sediment collapse.

In this way, the step of pushing the roof steel pipe 5 with the small jack 12 using the underground structure 9 as a reaction member, and the friction cutter plate 6 by the pushed amount.
And the step of excavating the underground structure 9 under the friction cutter plate 6 are appropriately repeated to remove the roof steel pipe 5 that has come out to the reaching pit 4 piece by piece.

When the tip of the underground structure 9 reaches the reaching pit 4, the blade opening 11 and the like are removed and backfilling grout is appropriately performed to complete the construction.

FIG. 8 shows another example. Regarding the propulsion method of the underground structure 9, a reaction force receiving member 16 and a center-hole type towing jack 17 are provided on the side of the reaching pit 4 and one end of the underground structure 9 is provided. The P. Towing member with C steel wire
By pulling 19 with this towing jack 17, reaching pit 4
The underground structure 9 can be pulled in from the side.

In this method, the underground structure 9 is used as a reaction member to push the roof steel pipe 5 with the small jack 12 while leaving the friction cutter plate 6 and tow the jack.
When 17 is extended by one stroke and the underground structure 9 is towed, the connection between the towing jack 17 and the towing member 19 and the connection between the towing member 19 and the fixing tool 18 are released, the positions are shifted, and the position is shifted again. Combine them and prepare for another towing.

[0017]

In the method of constructing an underground structure as shown in FIGS. 7 and 8, the roof steel pipe 5 is removed piece by piece in the reaching pit 4 as the underground structure 9 advances. Therefore, it is necessary to secure a place to install this reaching pit 4. Further, since the reaching pit 4 is always required, it is not possible to excavate an underground structure from both sides of a planned tunnel across a railway or the like and combine the underground structures at the center of the planned tunnel.

The present invention eliminates the inconvenience of the above-mentioned conventional example, and it is not necessary to provide a reaching tunnel at all, or only an extremely narrow reaching tunnel is required, and an underground structure is dug out from both sides of the planning tunnel. An object of the present invention is to provide a method and a device for constructing an underground structure that can be constructed so as to be integrated in the center of the building.

[0019]

In order to achieve the above-mentioned object, the present invention provides a method of constructing an underground structure, in which a box-shaped roof steel pipe having a friction cutter plate is arranged on the upper surface of a planned tunnel cross section. While paralleling in line with the required location and sequentially connecting from the start pit, press-fit into the required length of ground, making the front end of the underground structure face and close to the rear end of this roof steel pipe, leaving the friction cutter plate in the ground. Repeat the steps of appropriately cutting and removing the rear end of the roof steel pipe and the step of excavating the underground structure under the friction cutter plate for a length corresponding to the removed portion, or a planned tunnel with a railroad, etc. Install a launch pit on both sides of the, and install a box-shaped steel pipe for roof with a cross section with a friction cutter plate on the upper surface at the required location of the planned tunnel cross section. Side by side, connecting from both start shafts and press-fitting into the required length of ground, aligning the ends at the center of the planned tunnel, making the roof steel pipe end face and close to the front end of the underground structure, and friction cutter plate While removing the steel pipe end for the roof while appropriately leaving it in the ground, and the step of excavating the underground structure under the friction cutter plate for a length corresponding to the removed amount are sequentially repeated, and the underground structure is The idea is to combine them at the center of the planned tunnel, and as an underground structure construction device, it is pressed into the ground so as to penetrate from the starting pit to the arrival pit, and a friction cutter plate is installed on the upper surface. A steel pipe for roof that has a box-shaped cross section that can be placed and cut appropriately and a bearing that is provided at the front end of the underground structure and that supports the lower surface of the rear end of the steel pipe for roof that has a box-shaped cross section. And the member is for summarized in that comprising a stop member at the rear end of the friction cutter plate provided to the starting pit side.

[0020]

According to the present invention as set forth in claims 1 and 3, the roof steel pipe has a rear end appropriately cut and removed. Is there no need to provide a pit for removing the roof pipe? Or you can use a very narrow reach.

According to the present invention as set forth in claim 2, since it is not necessary to provide a reaching pit, it is possible to construct such that underground structures are dug from both sides of the planned tunnel and merged at the center of the planned tunnel. The construction period can be accelerated by the simultaneous construction of.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 are process diagrams showing a first embodiment of a method and an apparatus for constructing an underground structure according to the present invention, wherein the same constituent elements as those in FIGS. 7 and 8 showing the conventional example are designated by the same reference numerals. It was done.

Also in the present invention, a retaining steel sheet pile 2 is driven beside the upper traffic 1 such as a railroad to construct a starting pit 3 and a press-fitting machine (not shown) is installed in the starting pit 3 Then, the box-shaped steel pipes for roof 5 having a cross-section box shape are arranged in parallel in accordance with the required locations of the planned tunnel cross-section and press-fitted while sequentially connecting from the start pit 3. The press-fitting length may be determined according to the length of the planned tunnel, and the retaining steel sheet pile 2 may be driven to support the tip portion of the roof steel pipe 5. Although not shown, a narrow pit may be formed along the earth retaining steel sheet pile 2.

The roof steel pipe 5 is a box-shaped tubular body having a substantially square cross section, and a friction cutter plate 6 made of a flat steel plate is provided on the upper surface. The friction cutter plate 6 has its tip at the tip of the roof steel pipe 5. Although it is fixed by welding, etc., except for the tip, it is only placed by stacking it on the upper surface of the roof steel pipe 5, and when the roof steel pipes 5 are sequentially connected one by one, this friction cutter plate 6 is also used for the roof. The length of the steel pipe 5 is connected by welding or the like to make it longer.

The friction cutter plate 6
The rear end is fixed by a stop member 13 provided on the starting pit 3 side.

The method of arranging the steel pipes 5 is to match the required portion of the cross section of the planned tunnel. As shown in FIGS. 4 to 6, a single letter type (FIG. 4), a gate type (FIG. 5), and a box type (FIG. 6). Etc. are appropriately selected according to the underground structure 9 forming the tunnel. In the case of the one-letter type shown in FIG. 4, it is possible to combine an ordinary pipe roof 20 on the outside.

Although illustration is omitted, a reaction force wall is provided in the starting shaft 3.
The underground structure 9 made of a concrete box called a box culvert is set, and a thruster jack is provided between the reaction wall or the strut provided side by side with the reaction wall and the underground structure 9, and the underground structure 9 A hood-shaped blade 11 is provided at the tip, and the tip of the underground structure 9 and the rear end of the roof steel pipe 5 are opposed to and close to each other.

At the front end of the underground structure 9, a bearing receiving member 21 that supports the lower surface of the rear end of the roof steel pipe 5 is provided. The support receiving member 21 comprises a support 21a and a receiving member 21b placed on the supporting member 21a. The receiving member 21b may be a member such as a roller having a small frictional resistance for abutting against the roof steel pipe 5.

After this, as shown in FIG.
While leaving the friction cutter plate 6 in the ground, the rear end of the roof steel pipe 5 is appropriately cut and removed. For this removal work, a worker enters below the blade 11 from the inside of the underground structure 9,
Do it here. Further, the cut and removed portion passes through the inside of the underground structure 9 and is carried to the ground from the start pit 3.

Then, as shown in FIG. 3, the underground structure 9 is dug under the friction cutter plate 6 by a length corresponding to the removed portion of the rear end of the roof steel pipe 5.

The step of removing the rear end of the roof steel pipe 5 as appropriate and the step of excavating the underground structure 9 are sequentially repeated,
When the underground structure 9 reaches the other side of the planned tunnel, the support member 21 and the blade 11 are disassembled and passed through the inside of the underground structure 9 to be carried from the start pit 3 to the ground or formed into a narrow width. Remove from the pit.

7 to 9 show a second embodiment of the present invention, which is an application example of the first embodiment shown in FIGS. 1 to 3.

In this embodiment, the start pits 3 are provided on both sides of the planned tunnel with the upper traffic 1 such as a railroad line in between. Then, the box-shaped roof steel pipe 5 having the cross section box-shaped friction cutter plate 6 arranged from both launch shafts 3 to the upper surface is press-fitted into the required long distance while being connected in parallel in parallel with the required portion of the planned tunnel cross section. , The roof steel pipes 5 have their ends aligned with each other at the center of the planned tunnel.

In each starting pit 3, the front end of the underground steel structure is opposed to and close to the end of the roof steel pipe 5, and the end of the roof steel pipe 5 is appropriately cut and removed while leaving the friction cutter plate 6 in the ground. The step of excavating the underground structure 9 under the friction cutter plate 6 for a length corresponding to the removed portion is sequentially repeated.

In the underground structure 9 constructed and extended from both the start pits 3 in this way, the tips are close to each other at the center of the planned tunnel. Then, the bearing receiving member 21 and the blade 11 are disassembled, passed through the inside of the underground structure 9 and conveyed from the start pit 3 to the ground, and the gap at the same time as the tip of the underground structure 9 is filled with concrete or other means. The objects 9 are united.

[0036]

As described above, the method and apparatus for constructing an underground structure according to the present invention is constructed by excavating a large number of underground structures in a transverse direction at a shallow earth cover position in a lower ground such as a railway or a road. It is possible to construct without disturbing the upper traffic when doing, especially, it is not necessary to install a reaching pit at all or only an extremely narrow reaching pit,
It is also possible to construct an underground structure by excavating it from both sides of the planned tunnel and merging it in the center of the planned tunnel.

[Brief description of drawings]

FIG. 1 is a side view of a first step showing a first embodiment of a method and an apparatus for constructing an underground structure of the present invention.

FIG. 2 is a side view of a second step showing the first embodiment of the method and apparatus for constructing an underground structure of the present invention.

FIG. 3 is a side view of a third step showing the first embodiment of the method and apparatus for constructing an underground structure of the present invention.

FIG. 4 is an explanatory diagram showing a first arrangement example of roof steel pipes.

FIG. 5 is an explanatory view showing a second arrangement example of roof steel pipes.

FIG. 6 is an explanatory view showing a third arrangement example of roof steel pipes.

FIG. 7 is a side view of the first step showing the second embodiment of the method and apparatus for constructing an underground structure of the present invention.

FIG. 8 is a side view of a second step showing the second embodiment of the method and apparatus for constructing an underground structure of the present invention.

FIG. 9 is a side view of a third step showing the second embodiment of the method and apparatus for constructing an underground structure of the present invention.

FIG. 10 is a side view showing an example of a conventional example.

FIG. 11 is a side view showing another example of the conventional example.

[Explanation of symbols]

1 ... Upper traffic 2 ... Domechi steel sheet pile 3 ... Starting pit 4 ... Driving pit 5 ... Roof steel pipe 6 ... Friction cutter plate 8 ... Reaction wall 9 ... Underground structure 10 ... Pushing jack 11 ... Blade 12 ... Small Jack 13 ... Stopping member 14 ... Strut 16 ... Reaction force receiving material 17 ... Towing jack 18 ... Fixing tool 19 ... Towing member 20 ... Pipe roof 21 ... Bearing receiving member 21a ... Supporting work 21b ... Receiving material

Claims (3)

[Claims] 1. A box-shaped roof steel pipe having a cross-section box-shaped roof having a friction cutter plate disposed on the upper surface thereof is aligned in parallel with a required portion of a planned tunnel cross section and sequentially connected from a start pit to be press-fitted into a required long distance, Place the front end of the underground structure facing and close to the rear end of the roof steel pipe, remove the appropriate length of the rear end of the roof steel pipe while leaving the friction cutter plate in the ground, and remove the length corresponding to the removal. A method for constructing an underground structure, which comprises sequentially repeating a step of excavating an underground structure under a friction cutter plate. 2. Steel pipes for roofs having a box-shaped cross section, which are provided with starter shafts on both sides of a planned tunnel across a railway or the like, and friction cutter plates are arranged on the upper surface, are arranged in parallel in accordance with the required points of the planned tunnel cross section. While sequentially connecting from both launch shafts, press fit into the required length of the ground, match the ends at the center of the planned tunnel, make the roof steel pipe end face and approach the front end of the underground structure, and place the friction cutter plate in the ground. While leaving it, the process of appropriately cutting and removing the end of the steel pipe for the roof and the process of excavating the underground structure under the friction cutter plate by the length corresponding to the removed amount are sequentially repeated, and the underground structure is the center of the planned tunnel. A method for constructing an underground structure, which is characterized in that 3. A steel pipe for a roof having a box-shaped cross section, which is press-fitted into the ground so as to penetrate from a starting pit to a reaching pit, has a friction cutter plate mounted on the upper surface thereof, and can be appropriately cut to a long length. Underground structure characterized in that it is provided at the front end of the structure and consists of a support member that supports the lower surface of the rear end of the steel pipe for roof with a box-shaped cross section, and a stop member at the rear end of the friction cutter plate that is provided on the start pit side. Equipment for building things.